Sage Math Cloud Plotting Error, ValueError: cannot convert x to int

asked 2015-12-09 09:58:40 +0200

I'm using SageMathCloud to compute a summation

sum([.25^(100-i) * .75^(i) * binomial(100,i) for i in range(0, 63)])

0.00274614363169321

but am not able to plot it

plot(sum([.25^(100-i) * .75^(i) * binomial(100,i) for i in range(0, x)]),(x,1,63))

Error in lines 1-1
Traceback (most recent call last):
  File "/projects/sage/sage-6.9/local/lib/python2.7/site-packages/smc_sagews/sage_server.py", line 905, in execute
    exec compile(block+'\n', '', 'single') in namespace, locals
  File "", line 1, in <module>
  File "sage/symbolic/expression.pyx", line 1084, in sage.symbolic.expression.Expression.__int__ (/projects/sage/sage-6.9/src/build/cythonized/sage/symbolic/expression.cpp:8329)
    raise ValueError("cannot convert %s to int" % self)
ValueError: cannot convert x to int

What am I doing wrong here?

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